Detailed factors influencing the polishing process

Polishing refers to the processing method of reducing the surface roughness of workpiece to obtain a bright and smooth surface by means of mechanical, chemical or electrochemical action. It is the modification and processing of workpiece surface by means of polishing tools and abrasive particles or other polishing media.

MIM technologists have found that polishing does not improve the dimensional accuracy or geometric shape accuracy of the workpiece, but aims to obtain a smooth surface or mirror gloss, and is sometimes used to eliminate gloss (extinction). The polishing process usually USES the polishing wheel as the polishing tool. The polishing wheel is usually made of multiple layers of canvas, felt or leather and clamped with round metal plates on both sides.

So, what factors affect the polishing process? The following two factors influencing the polishing process are briefly introduced by guangdong dahong new material:

1. Influence of different hardness on polishing process

The hardness increases, but the roughness decreases after polishing. As a result of the increase in hardness, the polishing time required to achieve a lower roughness was increased accordingly. At the same time, the hardness increases, the possibility of excessive polishing is correspondingly reduced.

2. Influence of workpiece surface condition on polishing process

In the crushing process of machining, the surface of steel will be damaged by heat, internal stress or other factors, and improper cutting parameters will affect the polishing effect. Metal powder injection molding factory found that the surface after edm is more difficult to grind than the surface after normal machining or heat treatment. Therefore, precision edm dressing should be adopted before the end of edm, otherwise the surface will form a hardened thin layer. The maximum depth of the thermal impact layer can be up to 0.4mm in case of improper selection of electric spark finishing regulation. The hardness of the hardened thin layer is higher than that of the matrix and must be removed. Therefore, it is recommended to add a rough grinding process to completely remove the damaged surface layer, forming an average rough metal surface, providing a good foundation for the polishing process.

The above information is about the factors that affect the polishing process, and more about other polishing methods. Welcome to consult the professional team of MIM technology for metal powder injection molding of guangdong dahong new materials.